Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

X1226S8 Fiches technique(PDF) 9 Page - Intersil Corporation

No de pièce X1226S8
Description  Real Time Clock/Calendar with EEPROM
Download  25 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X1226S8 Fiches technique(HTML) 9 Page - Intersil Corporation

Back Button X1226S8 Datasheet HTML 5Page - Intersil Corporation X1226S8 Datasheet HTML 6Page - Intersil Corporation X1226S8 Datasheet HTML 7Page - Intersil Corporation X1226S8 Datasheet HTML 8Page - Intersil Corporation X1226S8 Datasheet HTML 9Page - Intersil Corporation X1226S8 Datasheet HTML 10Page - Intersil Corporation X1226S8 Datasheet HTML 11Page - Intersil Corporation X1226S8 Datasheet HTML 12Page - Intersil Corporation X1226S8 Datasheet HTML 13Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 25 page
background image
9
FN8098.3
May 8, 2006
Programmable Frequency Output Bits—FO1, FO0
These are two output control bits. They select one of
three divisions of the internal oscillator, that is applied
to the PHZ output pin. Table 4 shows the selection bits
for this output. When using the PHZ output function,
the Alarm IRQ output function is disabled.
Table 4. Programmable Frequency Output Bits
ON-CHIP OSCILLATOR COMPENSATION
Digital Trimming Register (DTR) — DTR2, DTR1
and DTR0 (Non-Volatile)
The digital trimming Bits DTR2, DTR1 and DTR0
adjust the number of counts per second and average
the ppm error to achieve better accuracy.
DTR2 is a sign bit. DTR2 = 0 means frequency
compensation is > 0. DTR2 = 1 means frequency
compensation is < 0.
DTR1 and DTR0 are scale bits. DTR1 gives 10 ppm
adjustment and DTR0 gives 20 ppm adjustment.
A range from -30ppm to +30ppm can be represented
by using three bits above.
Table 5. Digital Trimming Registers
Analog Trimming Register (ATR) (Non-volatile)
Six analog trimming Bits from ATR5 to ATR0 are pro-
vided to adjust the on-chip loading capacitance range.
The on-chip load capacitance ranges from 3.25pF to
18.75pF. Each bit has a different weight for capaci-
tance adjustment. Using a Citizen CFS-206 crystal
with different ATR bit combinations provides an esti-
mated ppm range from +116ppm to -37ppm to the
nominal frequency compensation. The combination of
digital and analog trimming can give up to +146ppm
adjustment.
The on-chip capacitance can be calculated as follows:
CATR = [(ATR value, decimal) x 0.25pF] + 11.0pF
Note that the ATR values are in two’s complement,
with ATR(000000) = 11.0pF, so the entire range runs
from 3.25pF to 18.75pF in 0.25pF steps.
The values calculated above are typical, and total load
capacitance seen by the crystal will include approxi-
mately 2pF of package and board capacitance in addi-
tion to the ATR value.
See Application Section and Intersil’s Application Note
AN154 for more information.
WRITING TO THE CLOCK/CONTROL REGISTERS
Changing any of the nonvolatile bits of the
clock/control register requires the following steps:
– Write a 02h to the Status Register to set the Write
Enable Latch (WEL). This is a volatile operation, so
there is no delay after the write. (Operation pre-
ceeded by a start and ended with a stop).
– Write a 06h to the Status Register to set both the
Register Write Enable Latch (RWEL) and the WEL
bit. This is also a volatile cycle. The zeros in the data
byte are required. (Operation preceeded by a start
and ended with a stop).
– Write one to 8 bytes to the Clock/Control Registers
with the desired clock, alarm, or control data. This
sequence starts with a start bit, requires a slave byte
of “11011110” and an address within the CCR and is
terminated by a stop bit. A write to the CCR changes
EEPROM values so these initiate a nonvolatile write
cycle and will take up to 10ms to complete. Writes to
undefined areas have no effect. The RWEL bit is
reset by the completion of a nonvolatile write cycle,
so the sequence must be repeated to again initiate
another change to the CCR contents. If the
sequence is not completed for any reason (by send-
ing an incorrect number of bits or sending a start
instead of a stop, for example) the RWEL bit is not
reset and the device remains in an active mode.
– Writing all zeros to the status register resets both the
WEL and RWEL bits.
– A read operation occurring between any of the previ-
ous operations will not interrupt the register write
operation.
FO1
FO0
Output Frequency
(average of 100 samples)
00
Alarm IRQ output
0
1
32.768kHz
1
0
4096Hz
11
1Hz
DTR Register
Estimated frequency
PPM
DTR2
DTR1
DTR0
00
0
0
01
0
+10
00
1
+20
01
1
+30
10
0
0
11
0
-10
10
1
-20
11
1
-30
X1226


Numéro de pièce similaire - X1226S8

FabricantNo de pièceFiches techniqueDescription
logo
Xicor Inc.
X1226S8 XICOR-X1226S8 Datasheet
420Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
X1226S8 INTERSIL-X1226S8 Datasheet
388Kb / 25P
   Real Time Clock/Calendar with EEPROM
logo
Renesas Technology Corp
X1226S8 RENESAS-X1226S8 Datasheet
993Kb / 25P
   4K (512 x 8), 2-Wire??RTC Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1226S8I XICOR-X1226S8I Datasheet
420Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
X1226S8I INTERSIL-X1226S8I Datasheet
388Kb / 25P
   Real Time Clock/Calendar with EEPROM
More results

Description similaire - X1226S8

FabricantNo de pièceFiches techniqueDescription
logo
Intersil Corporation
ISL12027 INTERSIL-ISL12027_10 Datasheet
390Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1240 XICOR-X1240 Datasheet
74Kb / 19P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12027 INTERSIL-ISL12027 Datasheet
414Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Renesas Technology Corp
ISL12027 RENESAS-ISL12027 Datasheet
1Mb / 29P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12026 INTERSIL-ISL12026 Datasheet
381Kb / 24P
   Real Time Clock/Calendar with EEPROM
ISL12029 INTERSIL-ISL12029 Datasheet
426Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1226 XICOR-X1226 Datasheet
420Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12028 INTERSIL-ISL12028 Datasheet
423Kb / 28P
   Real Time Clock/Calendar with EEPROM
X1226 INTERSIL-X1226 Datasheet
388Kb / 25P
   Real Time Clock/Calendar with EEPROM
X1243 INTERSIL-X1243 Datasheet
293Kb / 17P
   Real Time Clock/Calendar/Alarm with EEPROM
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com